Wilhelm majert



(N o Model.)

W; MAJ ERT; PLATE FOR A'OGUMULA-TORS.

No. 599,718 Patented Mar.- 1, 1898.

Ivzzre 71,30 7':

hzkdiforlqgym UNITED STATES WILHELM MAJERT, on GRUNAU, GERMANY.

PATENT OFFICE.

PLATE FOR ACCUMULATORS.

SPECIFICATION forming part of Letters Patent No. 599,718, dated March 1,1898. Application filed August 19, 1897. $eria1No. 648,804. (No model.)

To all whom it may concern:

Be it known that I, WILHELM MAJERT, a citizen of the German Empire,residing at Grunau, near Berlin, in the Kingdom of Prussia, Germany,haveinvented a new and useful Improvement in Plates for Accumulator-s,of

which the following is a specification.

The nature of my invention will be understood by the followingdescription.

Figure 1 is an elevation of a portion of one form of grating, and Fig. 1is a section on line w y thereof. Fig. 2 is a view similar to Fig. 1 ofanother form,'and Fig. 2 a section on line 00 y thereof. Fig. '3 is "anelevation of a portion of still another form, and Fig. 3 a section online a: y thereof. Fig. 4 is an elevation of a portion of still anothermodification, and Fig. 1 a section on line m y thereof; and Figs.- 5 and6 are perspective views of a portion of the form of plates shown inFigs. 1 and 2.

The same letters of reference in all the figures indicate the sameparts.

. out hindering expansion.

In accumulator-plates it is of importance that the mass should be firmlyheld but with- The mass should always remain in continual and intimatecontact with the metal that conducts the electricity, and this contactshould not cease during the expansion or during the contraction of themass. Further, it is'desirable that there should be thegreatest'possible surface for contact between the core and the masswithout, however, covering the mass too much from the electrolyte, whilethe weight should be as small as possible. Now

- the construction of plates and gratings according to thepresentinvention fulfils these requirements-by the fact that the ribs orgrating-Walls are bent out in the manner of corrugations either on oneside only or on both sides, so that the rods or bars remain straight inthe center and the corrugations have the form of semicones. Thecorrugations may also be alternately arranged on both sides, so as to beintermittent or alternating at top and bottom. This alternatearrangement is bars b b are arranged with their concavi ties facing eachother to provide the pocket for the mass at b In Figs. 1 and 5 thesemiconical corrugations, instead of being formed all on one side .of ahorizontal plane, as in Figs. 2 and 6, passing along the plate or bar,are formed first on one side and then upon the other side of saidhorizontal plane. By

' means of this arrangement the surface of the active mass'is notdiminished and a firm hold is afiorded to the latter in the inclinedsurfaces of the corrugations.

- Transverse bars I) I employ to divide the interior of the frame intocorrespondinglywide divisions. These transverse bars I; are corrugatedeither directly in the mold or after casting by means of special stamps,the arrangement being such that the corrugations of each two bars formtogether. one. The semioonical corrugations may also be employed withribbed plates. The ribs of a plate of this kind then form on the outsidea corrugated line, while they form astraight line at the base. Thecorrugations may also be arranged alternately. These corrugations mayalso be employed with a rectangular or polygonal form of grating, asshown in Figs. 3 and 4, in which it will be observed that the plates arearranged to cross or join each other at right angles, as in Fig. 3, orat obtuse angles, as in Fig. 4:. In this case the corrugations arearranged opposite toeach other, as shown at c and d.

Having now particularly described and as-. certained the nature of mysaid invention and in what manner the same is to be performed, I declarethat What I claim is 1. An accumulator-plate comprising the plate or barhaving corrugations therein of substantially the shape of the half of acone when divided on the line of its axis, substantially as described.

2. In an acoumulator-plate,-the plate or bar having a plurality ofcorrugations of substantially the shape of half of a cone divided on theline of its axis, with the apices of the cones arranged intermediate theedges of the plate, substantially as described.

In witness whereof I have hereunto signed my name, in the presence oftwo subscribin witnesses, this 20th day of May, 1897.

. WILHELM MAJ ERT.

Witnesses:

O. KRUEGER, H. HEIMAN.

